Details:

Creators:
Abboud, Bechara ; Coe, Joseph
Abboud, Bechara ; Coe, Joseph Less -
Corporate Creators:
Temple University. Department of Civil and Environmental Engineering
Corporate Contributors:
Pennsylvania. Department of Transportation. Bureau of Planning and Research ; United States. Department of Transportation. Federal Highway Administration
Pennsylvania. Department of Transportation. Bureau of Planning and Research ; United States. Department of Transportation. Federal Highway Administration Less -
Subject/TRT Terms:
[+]
Bridge Abutments Bridge Piers Construction Cost Effectiveness Countermeasures Design Design Guidelines Environmental Impacts Grout Guidelines In-the-Dry In-the-Wet Partially Grouted Riprap Permit IP And GP-11 Regulatory Agencies Riprap Scour Scour Critical Bridge Specifications Water Quality
Publication/ Report Number:
FHWA-PA-2019-004-TEM WO 001
Resource Type:
Tech Report
Geographical Coverage:
Pennsylvania ; United States
Pennsylvania ; United States Less -
Edition:
Final Report: 05/05/2014 – 08/30/2019
Corporate Publisher:
Pennsylvania. Department of Transportation. Bureau of Planning and Research
Abstract:
Partially grouted riprap (PGR) as a scour countermeasure is relatively new in the United States but has been used widely in Europe. Currently in Pennsylvania, the selection of appropriate scour countermeasures for bridge foundation protection have in general been limited in their applications to mainly dumped or hand-placed riprap, which can be displaced after major flood event. Hence, there is a critical need to develop guidelines to utilize PGR as a permanent countermeasure to control scour at bridge piers and abutments. The goal of this research project was to develop guidelines for scour countermeasure at piers and abutments using PGR in-the-dry and in-the-wet as a permanent countermeasure for scour control and remediation that minimizes environmental impacts, construction feasibility and demonstrates strong cost benefit/low life cycle costs. With the assistance of PennDOT District 6-0 Technical Advisor, an existing scour critical bridge SR 2028 was selected to have PGR as a permanent scour countermeasure to protect the structure from scour. Taking into consideration HEC-23 “Design Guideline 12”(1), draft design guidelines of PGR at bridge piers and abutments in-the-dry and in-the-wet was developed in collaboration and advisement on the technical direction of the research project by the Technical Advisor of PennDOT District 6-0 and the Technical Panel (regulatory agencies) of DEP and COE. The draft design guidelines included a description of PGR, materials, design standards, filter requirements, construction specifications in-the-dry and in-the-wet, water quality management, and measurement and payment. At the preapplication meeting for the recommended permit, the regulatory agencies, COE and DEP, rejected the General Permit GP-11 for the proposed placement of PGR in-the-wet at bridge SR 2028. The COE and DEP requested that the permit application be evaluated under the highest level of permitting, Department of Army Individual Permit (IP). The COE also specifically required a 404(b)(1) Guideline Analysis, which includes rigorous purpose, need, and alternative analysis. When comparing GP-11 to an IP permit, it became apparent that the IP permit required significantly more information, substantial preparation and time, and more construction details than GP-11. Since IP Permit was not within the scope of the research project, it was decided to construct the PGR at bridge SR 2028 in-the-dry under General Permit GP-11. The research project provided the much-needed tools for utilizing PGR as a lasting remedial scour countermeasure for existing scour critical bridges and as permanent scour countermeasure for bridges in District 6-0 and in the State of Pennsylvania. The developed design guideline of PGR in-the-dry at bridge piers and abutments will allow a uniform, practical, effective, and economical approach and design of scour countermeasure for PennDOT districts with scour-critical bridges. The application of the research resulted in utilizing PGR as the most functional and cost-effective scour countermeasure with improvement to environmental and streambed conditions at bridge SR 2028. To implement the findings in this research project, this report should be reviewed and commented on by all the districts in Pennsylvania with the intention for implementation as recommended practice. Additionally, this report should be submitted to the State Transportation Innovation Council (STIC) for broader development and deployment. Although this research project can be used as a standalone document, it would be beneficial to conduct further, complimentary research on PGR in-the-wet. The research study of PGR in-the-wet should quantify the environmental impacts with the initial impact of construction and maintenance on the water quality and aquatic life. Such research would allow the State of Pennsylvania to expand their knowledge and experience with PGR as a scour countermeasure and create more economical and functional practices throughout the state.
Format:
PDF
Funding:
4400011166, TEM WO 001
Collection(s):
US Transportation Collection
Main Document Checksum:
[+]
urn:sha256:0c849620d570c083fee9f86d6605ee7638bdaf2871accdbe619d2ab1797b5e6c
Download URL:
https://rosap.ntl.bts.gov/view/dot/62351/dot_62351_DS1.pdf
File Type:

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